1-[(E)-3-((1S,2S)-2-Carboxy-cyclopentyl)-but-2-enylidene]-pyrrolidinium; perchlorate

(1S,2S)-2-((E)-1-Methyl-3-oxo-propenyl)-cyclopentanecarboxylic acid

(1R,2R)-2-((1E,3E,5E)-6-Cyano-1,5-dimethyl-hexa-1,3,5-trienyl)-cyclopentanecarboxylic acid

(1S,2S)-2-((1E,3E,5E)-6-Cyano-1,5-dimethyl-hexa-1,3,5-trienyl)-cyclopentanecarboxylic acid

3-(2-Methoxycarbonyl-cyclopentyl)-2,3-epoxy-buttersaeure-aethylester